Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...66v&link_type=abstract
NOAO Proposal ID #1999A-0066
Other
Scientific paper
Among the galactic OB associations, Sco OB1 with the young open cluster NGC6231 as its nucleus stands out because of the extraordinary number of hot, very luminous stars. NGC6231 contains several massive spectroscopic binaries of spectral type O. This cluster is part of our programme aimed at the study of the X-ray properties of massive stars and will be observed in the X-ray domain within the framework of our guaranteed time on the forthcoming (launch in 1999) ESA XMM observatory. Despite their optical brightness, some of the (possible and true) binaries in NGC6231 are poorly known. Some are classified as SB1 systems; others have just at a few occasions exhibited double lines (SB2?) or a strong radial velocity variation (SB1?). The high resolution observations requested in the present proposal should help us to determine the orbital parameters of most of these systems (at least the bona-fide SB1), which is essential for the interpretation of the X- ray observations.
Gosset Eric
Rauw Gregor
Vreux Jean-Marie
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